JP6888772B2 - Wireless battery management system and battery pack including it - Google Patents

Description

The present invention relates to a wireless battery management system, and more particularly to a wireless battery management system that reduces the difference in remaining capacity between a plurality of battery modules and a battery pack including the same.

This application claims priority based on Korean Patent Application No. 10-2017-0091674 filed on July 19, 2017, and all the contents disclosed in the specification and drawings of the relevant application are incorporated into this application. ..

Recently, the demand for portable electronic products such as notebook PCs, video cameras, mobile phones, etc. has increased rapidly, and as the development of electric vehicles, storage batteries for energy storage, robots, satellites, etc. has started in earnest, repeated charging and discharging Research on high-performance secondary batteries that can be used is actively underway.

Currently, commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, lithium secondary batteries, etc. Among them, lithium secondary batteries have more memory than nickel-based secondary batteries. It is in the limelight because it has almost no effect, it can be charged and discharged freely, its self-discharge rate is very low, and its energy density is high.

A battery pack applied to an electric vehicle or the like usually includes a plurality of battery modules and a plurality of BMSs connected in series with each other. Each BMS monitors and controls the state of the battery module that it manages. Recently, the number of battery modules included in a battery pack is increasing due to the demand for a battery pack having a large capacity and a high output. In order to efficiently manage the state of each battery module included in such a battery pack, a single master-multi-slave structure is disclosed. The single master-multi-slave structure includes a plurality of slave BMSs provided in each battery module and a master BMS that generally controls the plurality of slave BMSs. At this time, communication between the plurality of slave BMSs and the master BMS may be performed wirelessly.

Each of the plurality of slave BMSs operates by using the electric energy of the battery module provided by the slave BMS. Therefore, when the battery pack is not in use or the electric energy of the battery module becomes less than the critical level, the multiple slave BMSs operating in the active mode should enter the sleep mode in response to the instruction of the master BMS. become. The sleep mode consumes less electrical energy than the active mode, which reduces the discharge rate of the battery module.

Each slave BMS can switch from the sleep mode to the active mode again only after receiving the wake-up command from the master BMS. Therefore, each slave BMS must check whether the master BMS is sending a wake-up instruction even in the sleep mode, whether it is periodic or aperiodic.

On the other hand, due to the operating environment of the battery pack and the electrochemical characteristics of the individual battery modules themselves, there is a difference in the remaining capacity between the plurality of battery modules. Balancing control is required to suppress the difference in remaining capacity between a plurality of battery modules. Patent Document 1 exists as a prior art related to this. Patent Document 1 controls a balancing device electrically connected between both ends of each battery included in the battery pack when the BMS of the battery pack goes into sleep mode, and suppresses a difference in charge capacity between the batteries. The technology is disclosed.

However, the prior art including Patent Document 1 has a limitation that the electric energy of the battery is not effectively utilized by balancing and is consumed as it is.

Korean Publication No. 10-2014-0060169 (published May 19, 2014)

The present invention has been made in view of the above problems, and the operation of scanning the wake-up command from the master BMS and the operation of the battery module by using the electric energy of each slave BMS in the sleep mode by itself. It is an object of the present invention to provide a wireless battery management system capable of performing balancing operation together and a battery pack including the same.

Other objects and advantages of the present invention will be understood by the description below and will be more apparent by the examples of the present invention. In addition, the objects and advantages of the present invention can be realized by means and combinations thereof shown in the claims.

Various examples of the present invention for achieving the above problems are as follows.

The one-sided wireless battery management system of the present invention is provided on a plurality of battery modules on a one-to-one basis, and operates by using the electric power supplied from the battery modules provided by the battery modules in the active mode and the sleep mode. , A plurality of slave BMS configured to wirelessly transmit a detection signal indicating the state of the battery module provided by the user in the active mode, and wirelessly receive the detection signal from each of the plurality of slave BMSs. Includes a master BMS configured in. The master BMS sets a scan cycle and a scan duration for each of the plurality of slave BMSs based on the detection signal, and wireless balancing indicating a scan cycle and a scan duration set for each of the plurality of slave BMSs. A control signal including an instruction is wirelessly transmitted to the plurality of slave BMSs.

Further, the master BMS calculates the charge state of each of the plurality of battery modules based on the detection signal, and based on the charge state of each of the plurality of battery modules, the scan cycle and scan duration for each of the plurality of slave BMSs. You can set the time.

Further, when the master BMS receives the operation stop command from the upper control unit, the master BMS may wirelessly transmit the first switching signal for inducing the switching from the active mode to the sleep mode to the plurality of slave BMSs.

Further, when the master BMS receives an operation start command from the upper control unit, the master BMS wirelessly transmits a second switching signal for inducing switching from the sleep mode to the active mode to the plurality of slave BMSs at each set cycle. Can be.

In addition, each of the plurality of slave BMSs themselves, in the sleep mode, for the scan duration set by itself for each scan cycle set by itself based on the radio balancing instruction included in the control signal. The second switching signal can be wirelessly scanned using the power supplied from the battery module provided with.

Further, each of the plurality of slave BMSs can switch from the sleep mode to the active mode when the scanning of the second switching signal in the sleep mode is successful.

Further, when each of the plurality of slave BMSs succeeds in scanning the second switching signal in the sleep mode, each of the plurality of slave BMSs wirelessly transmits a response signal informing the master BMS that the scanning of the second switching signal has been successful. obtain.

Further, each of the plurality of slave BMSs wirelessly transmits the response signal to the master BMS when the delay time corresponding to the ID assigned to the user has elapsed from the time when the scanning of the second switching signal is successful. Can be sent.

Further, the master BMS may reduce the set cycle by a predetermined value or a predetermined ratio each time the response signal is received from each of the plurality of slave BMSs.

Further, the master BMS may set the slave BMS provided in the battery module in the maximum charged state among the plurality of battery modules as the representative slave BMS. In this case, the control signal may further include a setting instruction for designating the representative slave BMS.

Further, the representative slave BMS may generate a synchronization signal based on the setting instruction in the sleep mode and wirelessly transmit the synchronization signal to the remaining slave BMS.

According to at least one of the embodiments of the present invention, each slave BMS in sleep mode can scan the wake-up instruction from the master BMS by using the electric energy of each battery module. As a result, the battery modules can be balanced without adding another circuit configuration for suppressing the difference in the remaining capacity between the battery modules.

Further, according to at least one of the embodiments of the present invention, each slave BMS adjusts the value of each parameter related to the scanning of the wake-up instruction according to the remaining capacity of the battery module provided by the slave BMS. , It is possible to achieve quick balancing while preventing over-discharging of the battery module.

Further, according to at least one of the embodiments of the present invention, the master BMS still scans the wake-up instruction by reducing the transmission cycle of the wake-up instruction each time each slave BMS succeeds in scanning the wake-up instruction. The remaining slave BMS that cannot succeed can be quickly guided to the active mode.

The effects of the present invention are not limited to those described above, and yet other effects not mentioned will be clearly understood by those skilled in the art from the claims.

The following drawings, which are attached to the present specification, exemplify a desirable embodiment of the present invention, and serve to further understand the technical idea of the present invention together with a detailed description of the present invention. It should not be construed as being limited to the matters described in the drawings.
It is a figure which shows schematic structure of the wireless battery management system by one Embodiment of this invention, and the battery pack including this. It is a figure which shows schematic the structure of the slave BMS shown in FIG. It is a figure which shows schematic structure of the master BMS shown in FIG. It is a timing chart referred to for explaining the operation which reduces the difference in the remaining capacity between a plurality of battery modules by the wireless battery management system according to one embodiment of the present invention. FIG. 5 is a timing chart referred to to illustrate an operation in which a wireless battery management system according to another embodiment of the present invention reduces a difference in remaining capacity between a plurality of battery modules. It is a timing chart referred to for explaining the operation which the wireless battery management system according to still another Embodiment of this invention reduces the difference of the remaining capacity between a plurality of battery modules. It is a graph which shows the process of reducing the difference of the remaining capacity between a plurality of battery modules by the wireless battery management system by one Example of this invention.

Hereinafter, desirable embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and the scope of claims should not be construed in a general or lexical sense, and the inventor himself should explain the invention in the best possible way. It must be interpreted in the meaning and concept corresponding to the technical idea of the present invention in accordance with the principle that the concept of the term can be properly defined.

Therefore, the embodiments described herein and the configurations shown in the drawings are merely one of the most desirable embodiments of the present invention and do not represent all of the technical ideas of the present invention. It must be understood that at the time of filing, there may be a variety of equivalents and variants that can replace them.

In addition, when it is determined that a specific description of a known function or configuration related to the present invention obscures the gist of the present invention, the description thereof will be omitted.

Terms that include ordinal numbers, such as first, second, etc., are used for the purpose of distinguishing any one of the various components from the rest, and such terms do not limit the components.

It should be noted that, throughout the specification, when a part "contains" a certain component, this does not exclude the other component, but may further include the other component, unless otherwise specified. Means that. Also, terms such as "control unit" as described herein refer to a unit that processes at least one function or operation, which can be embodied by hardware or software, or a combination of hardware and software. ..

Furthermore, when one part is "connected" to another throughout the specification, this is not only when it is "directly connected". It also includes the case where it is "indirectly (connected)" via another element in the middle.

It will be clarified in advance that "BMS", which is a term generally used in the present invention, is an abbreviation for Battery Management System.

FIG. 1 is a diagram schematically showing a configuration of a wireless battery management system 30 according to an embodiment of the present invention and a battery pack 10 including the wireless battery management system 30.

Referring to FIG. 1, the battery pack 10 includes a plurality of battery modules 20 and a wireless battery management system 30. Each battery module 20 may include at least one battery cell (see "21" in FIG. 2). The wireless battery management system 30 includes a plurality of slave BMS 100s and at least one master BMS 200. The battery pack 10 is mounted on an electric vehicle and can supply electric power required for driving an electric motor of the electric vehicle.

In the following, for convenience of description, it is assumed that the battery pack 10 contains three battery modules 20 and the wireless battery management system 30 contains three slave BMS 100s and a single master BMS 200. However, the scope of the present invention is not limited to this. For example, the battery pack 10 may include only two battery modules 20 or may include four or more battery modules 20. Of course, the wireless battery management system 30 may include two slave BMS 100s or four or more slave BMS 100s and may include two or more master BMS 200s.

The plurality of slave BMS 100s are provided so as to have a one-to-one correspondence with the plurality of battery modules 20 included in the battery pack 10.

Each of the plurality of slave BMS 100s is electrically connected to any one of the plurality of battery modules 20 provided by the slave BMS 100. Each of the plurality of slave BMS 100s detects the general state (for example, voltage, current, temperature) of the battery module 20 electrically connected to itself, and various control functions (for example) for adjusting the state of the battery module 20. , Charging, discharging, balancing). At this time, each control function may be executed directly by the slave BMS 100 based on the state of the battery module 20, or may be executed in response to an instruction from the master BMS 200.

FIG. 2 is a diagram schematically showing the configuration of the slave BMS 100 shown in FIG.

Referring to FIG. 2, each of the plurality of slave BMS 100s may include a slave memory 110, a slave communication unit 120, a slave power supply unit 130, and a slave control unit 140.

The ID assigned in advance to the slave BMS is stored in the slave memory 110. The ID may be pre-assigned at the time of manufacture of the slave BMS 100 including the slave memory 110. The ID can be used by each of the plurality of slave BMS 100s to wirelessly communicate with the master BMS 200. At this time, the ID pre-assigned to any one of the plurality of slave BMS 100s may be different from the ID pre-assigned to the remaining slave BMS 100s.

Each ID can be used by the master BMS 200 to distinguish each slave BMS 100 from the remaining slave BMS 100. In addition, each ID may indicate which of the plurality of battery modules 20 the slave BMS 100 to which it has been assigned is provided.

The type of the slave memory 110 is not particularly limited as long as it is a known information storage means known to be able to record, erase, update, and read data. As an example, the slave memory 110 may be a DRAM, SDRAM, flash memory 120, ROM, EEPROM, a register, or the like. The slave memory 110 may store a program code in which a process that can be executed by the slave control unit 140 is defined.

On the other hand, the slave memory 110 may be physically separated from the slave control unit 140, or may be integrated with the slave control unit 140 on a chip or the like.

The slave communication unit 120 includes a slave antenna 121 and a slave communication circuit 122. The slave antenna 121 and the slave communication circuit 122 are interoperably connected. The slave communication circuit 122 demodulates the radio signal received by the slave antenna 121. Further, the slave communication circuit 122 may provide the slave antenna 121 after modulating the signal provided by the slave control unit. The slave antenna 121 may simultaneously or selectively transmit a radio signal corresponding to the signal modulated by the slave communication circuit 122 to another slave BMS or master BMS 200.

The slave sensing unit 130 uses the power supplied from the battery module 20 to generate a power supply voltage having at least one predetermined level. The power supply voltage generated by the slave power supply unit 130 may be individually provided to the slave memory 110 and the slave communication unit 120. Further, the power supply voltage generated by the slave power supply unit 130 may be provided to each processor included in the slave control unit 140. For example, the first power supply voltage generated by the slave power supply unit 130 is used as the operating power supply for each processor included in the slave control unit 140, and the second power supply voltage generated by the slave power supply unit 130 is the slave memory 110. And can be used as an operating power source for each of the slave communication units 120.

The slave control unit 140 includes at least one processor and is operably connected to the slave memory 110, the slave communication unit 120, and the slave power supply unit 130. The slave control unit 140 is configured to manage the general operation of the slave BMS 100 including itself.

The slave control unit 140 may include a sensing unit configured to detect the state of the battery module 20. For example, the sensing unit may include a voltage measuring circuit that detects the voltage of the battery module 20, a current measuring circuit that detects the current of the battery module 20, or a temperature detecting circuit that detects the temperature of the battery module 20. The slave control unit 140 provides the slave communication unit 120 with sensing information indicating the detected state of the battery module 20. As a result, the slave communication unit 120 transmits the radio signal corresponding to the sensing information to the master BMS 200 by the slave antenna 121.

Each processor included in the slave control unit 140 is a processor known in the industry for executing various control logs, an ASIC (application-specific integrated circuit), another chipset, a logic circuit, a register, and a communication modem. , Data processing equipment, etc. may be selectively included. At least one or more of the various control logs of the slave control unit 140 are combined, and the combined control logs can be created by a computer-readable code system and recorded on a computer-readable recording medium. The type of recording medium is not particularly limited as long as it can be accessed by the processor included in the computer. As an example, the recording medium includes at least one selected from the group including ROM, RAM, registers, CD-ROMs, magnetic tapes, hard disks, floppy disks and optical data recording devices. Further, the code system may be modulated into a carrier signal and included in a communication carrier at a specific time point, and may be distributed, stored and executed in computers connected by a network. Also, functional programs, codes and code segments for embodying combined control logs can be easily inferred by programmers in the technical field to which the present invention belongs.

FIG. 3 is a diagram schematically showing the configuration of the master BMS 200 shown in FIG.

Referring to FIG. 3, the master BMS 200 may include a master memory 210, a master communication unit 220, a master power supply unit 230 and a master control unit 240.

The ID table may be stored in the master memory 210 in advance. The ID table includes each ID pre-assigned to the plurality of slave BMSs.

The type of the master memory 210 is not particularly limited as long as it is a known information storage means known to be capable of recording, erasing, updating, and reading data. As an example, the master memory 210 can be a DRAM, SDRAM, flash memory 120, ROM, EEPROM, or a register. The master memory 210 may store program code in which a process that can be executed by the slave control unit 140 is defined.

On the other hand, the master memory 210 may be physically separated from the master control unit 240, or may be integrated with the master control unit 240 on a chip or the like.

The master communication unit 220 includes a master antenna 221 and a master communication circuit 222. The master antenna 221 and the master communication circuit 222 are interoperably connected. The master communication circuit 222 may demodulate the radio signal received through the master antenna 221. The master communication circuit 222 may also modulate the signal to be transmitted to each slave BMS 100 and then wirelessly transmit the modulated signal through the master antenna 222. The master antenna 221 may selectively transmit a radio signal corresponding to the signal modulated by the master communication unit 220 to at least one of the plurality of slave BMS 100s.

The master power supply unit 230 uses at least one battery module 20, an external power source, or electrical energy supplied from a power source (Batt) provided in the master power supply unit 230 to generate at least one power supply voltage. The power supply voltage generated by the master power supply unit 230 may be provided to the master memory 210 and the master communication unit 220. Further, the power supply voltage generated by the master power supply unit 230 may be provided to each processor included in the master control unit 240.

The master control unit 240 includes at least one processor and is operably connected to the master memory 210 and the master communication unit 220. The master control unit 240 is configured to manage the overall operation of the master BMS 200. Further, the master control unit 240 has an SOC (State Of Charge) and / or SOC (State Of Charge) of each of the plurality of slave BMS 100s based on the radio signals corresponding to the sensing information of each of the plurality of slave BMS 100s among the radio signals received through the master antenna 221. Alternatively, SOH (State Of Health) can be calculated. Further, the master control unit 240 generates information for controlling charging, discharging, and / or balancing of each of the plurality of slave BMS 100s based on the calculated SOC and / or SOH, and then the master antenna 221 and the master communication unit. It may selectively transmit to at least one of a plurality of slave BMS 100s through 220.

Each processor included in the master control unit 240 selects a processor known in the industry, an ASIC, another chipset, a logic circuit, a register, a communication modem, a data processing device, etc. in order to execute various control logs. Can be included. At least one or more of the various control logs of the master control unit 240 are combined, and the combined control logs can be created as a computer-readable code system and recorded on a computer-readable recording medium. The type of recording medium is not particularly limited as long as it can be accessed by the processor included in the computer. As an example, the recording medium includes at least one selected from the group including ROM, RAM, registers, CD-ROMs, magnetic tapes, hard disks, floppy disks and optical data recording devices. Further, the code system may be modulated into a carrier signal and included in a communication carrier at a specific time point, and may be distributed, stored and executed in computers connected by a network. Also, functional programs, codes and code segments for embodying combined control logs can be easily inferred by programmers in the technical field to which the present invention belongs.

On the other hand, each slave BMS 100 may selectively operate in the active mode, the sleep mode, and the shutdown mode. In the present invention, the active mode is a mode in which the battery module 20 is activated in a situation where the battery module 20 is charged / discharged (for example, a state in which the start of the electric vehicle is on). When entering the active mode, each slave BMS 100 can continuously use the power supplied from the battery module 20 to perform all functions for managing the state of the battery module 20 without limitation.

In the present invention, the sleep mode is a mode in which the battery module 20 is activated not in a faulty state (for example, over-discharge) but in a situation where the battery module 20 is not charged / discharged (for example, a state in which the start of the electric vehicle is off). .. When entering sleep mode, each slave BMS 100 may perform only limited functions using the power supplied by the battery module 20 only during a period of time when predetermined conditions are met.

In the present invention, the shutdown mode is a mode in which the execution of all functions using the power supplied from the battery module 20 is cut off when the battery module 20 is placed in a faulty state.

The master BMS 200 wirelessly transmits a first switching signal to a plurality of slave BMSs when receiving an operation stop command from the upper control unit 1 of a device (for example, an electric vehicle) on which the battery pack 10 is mounted. The upper control unit 1 may output an operation stop command to the master BMS, for example, when the start of the electric vehicle is changed from on to off. The first switching signal may be a signal that induces switching from the active mode to the sleep mode.

When the master BMS200 receives the operation start command from the upper control unit 1, the master BMS200 wirelessly transmits the second switching signal to the plurality of slave BMSs. The second switching signal is a kind of wake-up instruction. The upper control unit 1 may output an operation start command to the master BMS, for example, when the start of the electric vehicle is changed from off to on. The second switching signal can be a signal that induces switching from the sleep mode to the active mode.

In the active mode, each slave BMS 100 detects the state of the battery module 20 provided by the slave BMS 100 at predetermined intervals or each time there is a request from the master BMS 200, and masters a detection signal indicating the detected state. It is configured to transmit wirelessly to the BMS 200. The master BMS 200 wirelessly receives detection signals from each of the plurality of slaves BMS 100-1 to 100-3, and based on each received detection signal, the charging state (SOC) of each of the plurality of battery modules 20-1 to 20-3. ) Is calculated. The charged state indicates the remaining capacity of the battery module 20.

Next, the master BMS 200 sets the scan cycle and the scan duration for each of the plurality of slave BMSs based on the charge state of each of the plurality of battery modules 20-1 to 20-3. At this time, there is a relationship of "scan cycle ≥ scan duration".

The master BMS 200 may store the scan cycle and scan duration set for each of the plurality of slaves BMS 100-1 to 100-3 in the master memory 210.

According to one embodiment, the scan durations set for the plurality of slave BMS 100-1 to 100-3 are the same, and each slave BMS 100 has a scan that is inversely proportional to the charge state of the battery module 20 provided with the slave BMS 100. The cycle can be set. For example, the scan cycle set for any one slave BMS 100 can be an integral multiple of the scan cycle set for at least one of the remaining slave BMS 100s.

According to another embodiment, the scan cycles set in the plurality of slave BMS 100-1 to 100-3 are the same, and each slave BMS 100 has a scan proportional to the charge state of the battery module 20 provided with the slave BMS 100. The duration can be set. For example, the slave BMS 100 provided in the battery module 20 having SOC = 70% is set to have a scan duration of 3 seconds, and the slave BMS 100 provided in the battery module 20 having SOC = 50% has 2 seconds. Scan duration can be set.

Further, according to another embodiment, the scan cycle and the scan duration set in each slave BMS 100 may be different from the scan cycle and the scan duration set in the other slave BMS 100, respectively.

Of course, if the difference in charge status between the battery modules 20-1 to 20-3 is within a predetermined error range, the plurality of slave BMS 100-1 to 100-3 have the same scan cycle and the same scan duration. The time can be set.

The master BMS 200 indicates a scan cycle and a scan duration set for each of the plurality of slave BMS 100-1 to 100-3 based on the detection signals wirelessly received from the plurality of slave BMS 100-1 to 100-3. Generate a radio balancing instruction. Further, the master BMS 200 wirelessly transmits a control signal including the generated radio balancing instruction to the plurality of slaves BMS 100-1 to 100-3. The control signal is wirelessly transmitted to the plurality of slaves BMS 100-1 to 100-3 at the same time as the first switching signal or before the transmission of the first switching signal.

Each of the plurality of slaves BMS 100-1 to 100-3 receives a control signal wirelessly from the master BMS 200. Further, each of the plurality of slaves BMS 100-1 to 100-3 can save the scan cycle and the scan duration set by the slave BMS 100-1 to 100-3 in the slave memory 110 by the radio balancing instruction included in the received control signal. ..

When the plurality of slaves BMS100-1 to 100-3 enter the sleep mode in response to the first switching signal, the slave control units 140 of each of the plurality of slaves BMS100-1 to 100-3 enter the sleep mode before entering the sleep mode. The scanning pulse signal corresponding to the scan cycle and the scan duration set by the last received control signal is output to the slave communication unit 130. For example, a scanning pulse signal is a signal in which an ascending edge and a descending edge are repeated, and the time from any one ascending edge to the immediately following ascending edge is the same as the scan cycle, and any one ascending edge is used. The time from to the descending edge immediately after can be the same as the scan duration.

The slave communication circuit 122 can scan the second switching signal from the master BMS 200 via the slave antenna 121 in response to the scanning pulse signal from the slave control unit 140. More specifically, the slave communication circuit 122 uses the operating power supply from the slave power supply unit 130 for the time from the rising edge of the scanning pulse signal output to itself to the falling edge immediately after it, and uses the slave antenna 121. The presence or absence of the second switching signal can be scanned wirelessly through the device. On the other hand, the slave communication circuit 122 may stop scanning for the second switching signal during the time from the falling edge of the scanning pulse signal output to itself to the rising edge immediately after it.

In the following, each of the examples in which the master BMS 200 controls a plurality of slave BMS 100-1 to 100-3 and reduces the difference in the remaining capacity between the plurality of battery modules 20-1 to 20-3 will be specifically described.

For convenience of explanation, the charged state of the battery module 20-1 provided with the first slave BMS100-1 is the largest, and the charged state of the battery module 20-2 provided with the second slave BMS100-2 is the second. It is assumed that the battery module 20-3 provided with the third slave BMS 100-3 has the smallest charge state.

FIG. 4 is a timing chart referred to for explaining an operation in which a wireless battery management system according to an embodiment of the present invention reduces a difference in remaining capacity between a plurality of battery modules.

Referring to FIG. 4, at time _{t 1,} the upper control unit 1 outputs the operation stop command to the master BMS200. Once _{t 2,} the master BMS200, depending on the operation stop command is transmitted wirelessly to a plurality of slave BMS100-1~100-3 in the first Suichingu signal to the active mode. Since the first to third slaves BMS100-1 to 100-3 are all operating in the active mode, the master BMS200 can normally receive the first switching signal only once. First to third slave BMS100-1~100-3, in response to the first Suichingu signal, from the time _{t 3} to operate in the sleep mode.

Before time _{t 3 (e.g., t} 2), the master BMS200 transmits a control signal by radio may set the first to third slave BMS100-1~100-3 each scan cycle and the scan duration. Control signal, the master BMS200 before time _{t 1} is obtained is based on detection signals received from a plurality of slave BMS100-1~100-3 last.

Slave control unit 140 of the first slave BMS100-1 outputs the first scanning pulse signal 401 after time _{t 3} to the slave communication circuit 122. The first scanning pulse signal 401 is defined by a _{first scan period T 1} and a first scan duration D _1.

Slave control unit 140 of the second slave BMS100-2 outputs the second scanning pulse signal 402 after time _{t 3} to the slave communication circuit 122. The second scanning pulse signal 402 is defined by a _{second scan period T 2} and a second scan duration D _2.

Slave control unit 140 of the third slave BMS100-3 outputs the third scanning pulse signal 403 after time _{t 3} to the slave communication circuit 122. The third scanning pulse signal 403 is defined by a _{third scan period T 3} and a third scan duration D _3.

Suppose the master BMS200 sets different scan cycles and mutually same scan durations for the first to third slaves BMS100-1 to 100-3. In this case, D ₁ = D ₂ = D ₃ and T ₃ > T ₂ > T ₁ . This causes the first slave BMS100-1 to use more energy for scanning the second switching signal than the second and third slaves BMS100-2, 100-3. As a result, the charging state of the first battery module 20-1 provided with the first slave BMS100-1 becomes lower at a faster speed than the charging state of the second and third battery modules 20-2 and 20-3. Will be. Similarly, the charging state of the second battery module 20-2 provided with the second slave BMS100-2 becomes lower at a faster speed than the charging state of the third battery module 20-3.

Once _{t 4} when the first to third slave BMS100-1~100-3 are scanned for the presence of the second Suichingu signal using the first to third scanning pulse signal 401, the host controller 1 The operation start command is output to the master BMS200.

Master BMS200, depending on the operation start instruction, transmits the second Suichingu signal every set period _{P 1} from the time point _{t 5} wirelessly. At time _{t 5,} since it has a low level of any predetermined first to third scanning pulse signal 401, the time any of the first to third slave BMS100-1~100-3 _{t 5} Failed to scan the second switching signal transmitted from. As a result, no response signal is transmitted to the master BMS 200 from any of the first to third slave BMS 100-1 to 100-3.

Once _{t 6 where P 1} has passed from the time point _{t 5,} the master BMS200 transmits the second Suichingu signal wirelessly. Once _{t 6,} the first scanning pulse signal 401 is different from the second and third scanning pulse signal 402 and 403, because they have a high level to a predetermined, first slave BMS100-1 second and third It succeeds in scanning the second switching signal before the slaves 100-2 and 100-3.

Thus, the first slave BMS100-1 operates by switching from time _{t 6} to the active mode from the sleep mode. The first slave BMS100-1 is a time _{t 7,} wirelessly transmits a response signal indicating a successful scan of the second Suichingu signal to the master BMS200. At this time, the time point t ₇ may be a time point at which _{the delay time R 1} corresponding to the ID of the first slave BMS 100-1 has elapsed from the time point t _6.

Master BMS200, based on the response signal from the first slave BMS100-1, may decrease the set period _{P 1.} Desirably, the master BMS 200 may reduce the recent set period by a predetermined value or a predetermined percentage each time it receives a response signal from each slave BMS 100. For example, as shown in FIG. 4, the master BMS200 from after the time _{t 7,} it may transmit wirelessly a second Suichingu signal for each new set period _{P 2.}

The master BMS200 wirelessly transmits the second switching signal at the time t8 when the set cycle P2 elapses from the time t6 when the second switching signal is finally transmitted. At time point t8, the second scanning pulse signal 402 , unlike the third scanning pulse signal 403, has a predetermined high level, so that the second slave BMS 100-2 precedes the third slave 100-3. Succeeded in scanning the second switching signal.

Thus, the second slave BMS100-2 operates by switching from time _{t 8} to the active mode from the sleep mode. The second slave BMS100-2 is a time _{t 9,} wirelessly transmits a response signal indicating a successful scan of the second Suichingu signal to the master BMS200. At this time, the time point t ₉ may be a time point at which _{the delay time R 2} corresponding to the ID of the second slave BMS 100-2 has elapsed from the time point t _8. Since the ID of the first and second slave BMS100-1,100-2 are different, the delay time _{R 1} and the delay time _{R 2} may also be different.

Master BMS200, based on the response signal from the second slave BMS100-2, may decrease the set period _{P 2.} For example, as shown in FIG. 4, the master BMS200 from later time _{t 9,} it may wirelessly transmit the second Suichingu signal for each new set period _{P 3.} The set cycle P ₃ may be shorter than _{the third scan duration D 3} set on the third slave BMS 100-3, which is still operating in sleep mode.

Although not shown, by the master BMS200 every short setting period _{P 3} than the third scan period _{T 3} transmits the second Suichingu signal by radio, the third slave at any time after the time _{t 10} BMS100- 3 can operate by successfully scanning the second switching signal and switching to the active mode. Similarly, the third slave BMS100-3 is a response signal notifying that the second switching signal has been successfully scanned when a delay time corresponding to its own ID has elapsed from the time when the second switching signal was successfully scanned. Can be wirelessly transmitted to the master BMS 200.

When the master BMS 200 wirelessly receives the response signals from all the slaves BMS 100-1 to 100-3 included in the wireless battery management system 30, the wireless transmission of the second switching signal may be interrupted.

FIG. 5 is a timing chart referenced to illustrate the operation of a wireless battery management system according to another embodiment of the present invention to reduce the difference in remaining capacity between a plurality of battery modules.

Referring to FIG. 5, at time _{t 11,} the upper control unit 1 outputs the operation stop command to the master BMS200. At _{t 12,} the master BMS200, depending on the operation stop command, transmits the first Suichingu signal wirelessly to a plurality of slave BMS100-1~100-3 in the active mode. Since the first to third slaves BMS100-1 to 100-3 are all operating in the active mode, the master BMS200 can normally receive the first switching signal only once. First to third slave BMS100-1~100-3, in response to the first Suichingu signal, from the time _{t 13} to operate in the sleep mode.

Prior to time point t ₁₃ (eg, t ₁₂ ), the master BMS 200 may wirelessly transmit control signals to set the scan cycle and scan duration for each of the first to third slave BMS 100-1 to 100-3. Control signal, the master BMS200 before time _{t 11} is obtained is based on detection signals received from a plurality of slave BMS100-1~100-3 last.

Slave control unit 140 of the first slave BMS100-1 outputs the first scanning pulse signal 501 after the time _{t 13} the slave communication circuit 122. The first scanning pulse signal 501 is defined by a _{first scan period T 11} and a first scan duration D _11. Slave control unit 140 of the second slave BMS100-2 outputs the second scanning pulse signal 502 after the time _{t 13} the slave communication circuit 122. The second scanning pulse signal 502 is defined by a _{second scan period T 12} and a second scan duration D _12. Slave control unit 140 of the third slave BMS100-3 outputs the third scanning pulse signal 503 after the time _{t 13} the slave communication circuit 122. The third scanning pulse signal 503 is defined by a _{third scan period T 13} and a third scan duration D _13.

With reference to FIG. 4, suppose that the master BMS 200 sets the first to third slaves BMS 100-1 to 100-3 to have the same scan period and different scan durations, unlike the above. In this case, D ₁₁ > D ₁₂ > D ₁₃ and T ₁₁ = T ₁₂ = T ₁₃ . This causes the first slave BMS100-1 to use more energy to scan the second switching signal than the second and third slaves BMS100-2, 100-3. As a result, as in the situation described above with reference to FIG. 4, the state of charge of the first battery module 20-1 provided with the first slave BMS100-1 is the second and third battery modules 20-2, It becomes lower at a faster speed than the charged state of 20-3. Similarly, the charging state of the second battery module 20-2 provided with the second slave BMS100-2 becomes lower at a faster speed than the charging state of the third battery module 20-3.

Upper control unit 1 when _{t 14} where the first to third slave BMS100-1~100-3 are scanning for the presence of the second Suichingu signal using the first to third scanning pulse signal 501, 502 and 503 is The operation start command is output to the master BMS200.

Master BMS200, depending on the operation start instruction, transmits the second Suichingu signal wirelessly from the time _{t 15} for each set cycle _{P 11.} At time _{t 15,} the first to third scanning pulse signal to have a low level of both was also predetermined in 501, 502, 503, first to third time none of the slave BMS100-1~100-3 _{t 15} The scan of the second switching signal transmitted in is unsuccessful. As a result, no response signal is transmitted to the master BMS 200 from any of the first to third slave BMS 100-1 to 100-3.

Once _{t 16 where P 11} has passed from the time _{t 15,} the master BMS200 transmits the second Suichingu signal wirelessly. However, at time _{t 16,} since it has a low level of any predetermined first to third scanning pulse signal 501, 502, 503, any of the first to third slave BMS100-1~100-3 failure to scanning second Suichingu signal transmitted at time t _16. As a result, no response signal is transmitted to the master BMS 200 from any of the first to third slave BMS 100-1 to 100-3.

Once _{t 17 where P 11} has passed from the time _{t 16,} the master BMS200 transmits the second Suichingu signal wirelessly. Once _{t 17,} first to third scanning pulse signal 501, 502, 503, since all have the high level, both of the first to third slave BMS100-1~100-3 scanning second Suichingu signal Succeed in.

Thus, the first to third slave BMS100-1~100-3 each operate by switching from time _{t 17} to the active mode from the sleep mode.

On the other hand, the first slave BMS100-1 is the time _{t 18} has elapsed from the time _{t 17} by a delay time _{R 11} corresponding to their ID, and response signal indicates a successful scan of the second Suichingu signal to the master BMS200 Send wirelessly.

The second slave BMS100-2 is the time _{t 19} has elapsed from the time t17 by a delay time _{R 12} corresponding to their ID, wireless response signal indicating the successful scanning of the second Suichingu signal to the master BMS200 Send with. Since the IDs of the first and second slaves BMS100-1 and 100-2 are different, the delay time R ₁₁ and the delay time R ₁₂ may also be different.

The third slave BMS100-3 is the time _{t 20} has elapsed from the time _{t 17} by a delay time _{R 13} corresponding to their ID, and response signal indicates a successful scan of the second Suichingu signal to the master BMS200 Send wirelessly. Since the IDs of the first to third slaves BMS 100-1 to 100-3 are different, the delay time R ₁₃ may be different from the delay time R ₁₁ and the delay time R _12.

When the master BMS 200 wirelessly receives the response signal from all the slaves BMS 100-1 to 100-3 included in the wireless battery management system 30, the master BMS 200 may interrupt the wireless transmission of the second switching signal.

On the other hand, as described above, even if two or more slave BMS 100s succeed in scanning the second switching signal at the same time point, each slave BMS 100 wirelessly transmits a response signal at a time point different from that of the other slave BMS 100s. As a result, it is possible to reduce a signal interference phenomenon caused by wirelessly transmitting a large number of response signals to the master BMS 200 at the same time.

FIG. 6 is a timing chart referenced to illustrate the operation of a wireless battery management system according to yet another embodiment of the present invention to reduce the difference in remaining capacity between a plurality of battery modules.

Referring to FIG. 6, the upper control unit 1 at time _{t 21} outputs the operation stop command to the master BMS200. Once _{t 22,} the master BMS200, depending on the operation stop command is transmitted wirelessly to a plurality of slave BMS100-1~100-3 in the first Suichingu signal to the active mode. Since the first to third slaves BMS100-1 to 100-3 are all operating in the active mode, the master BMS200 can normally receive the first switching signal only once. First to third slave BMS100-1~100-3, in response to the first Suichingu signal, from the time _{t 23} to operate in the sleep mode.

On the other hand, the master BMS200 sets the slave BMS100-1 provided in the battery module 20-1 in the maximum charge state among the plurality of battery modules 20-1 to 20-3 as the representative slave BMS in response to the operation stop command. , Can generate a setting instruction to specify the representative slave BMS.

Before the time point t ₂₃ (for example, t ₂₂ ), the master BMS 200 wirelessly transmits a control signal including the setting instruction, and the scan cycle and scan duration of each of the first to third slave BMS 100-1 to 100-3. Can be set.

The first slave BMS100-1 can check that one of the first to third slaves BMS100-1 to 100-3 has been set as the representative slave BMS based on the setting instruction included in the control signal.

Between the time point t ₂₂ and the time point t ₂₃ , the first slave BMS100-1 set as the representative slave BMS may output a synchronization signal to the remaining slaves BMS100-2 and 100-3. The time point t ₂₄ may be a time point at which the rising edge of the scanning pulse signal output by the representative slave BMS first occurs. The synchronization signal is a signal that induces the rising edge of the scanning pulse signals 602 and 603 of the remaining slaves BMS 100-2 and 100-3 at the same time as the rising edge of the scanning pulse signal 601 of the first slave BMS 100-1 occurs. Can be.

Optionally, representative first slave BMS100-1 which is set as a slave BMS the remaining slave auxiliary synchronization signal periodically indicating a timing to their rising edge after the time _{t 24} is generated BMS100-2,100 Can be transmitted wirelessly to -3.

Slave control unit 140 of the first slave BMS100-1 outputs the first scanning pulse signal 601 from the time _{t 24} the slave communication circuit 122. The first scanning pulse signal 601 is defined by a _{first scan period T 21} and a first scan duration D _21. Slave control unit 140 of the second slave BMS100-2 is by the synchronizing signal, and outputs the second scanning pulse signal 602 from the time _{t 24} the slave communication circuit 122. The second scanning pulse signal 602 is defined by a _{second scan period T 22} and a second scan duration D _22. Slave control unit 140 of the third slave BMS100-3 is by the synchronizing signal, and outputs the third scanning pulse signal 603 from the time _{t 24} the slave communication circuit 122. The third scanning pulse signal 603 is defined by a _{third scan period T 23} and a third scan duration D _23. Rising edge of the first to third scanning pulse signal 601, 602 and 603, you can be sure that you are synchronized at the same point in time _{t 24} from FIG.

_{The first to third scan cycles T 21} , T ₂₂ , T ₂₃ and the first to third scan durations D ₂₁ , D ₂₂ set by the master BMS 200 in the first to third slave BMS 100-1 to 100-3, respectively. , D ₂₃ is D ₂₁ = D ₂₂ = D ₂₃ , T ₂₂ = 2 × T ₂₁ , and T ₂₃ = 3 × T ₂₁ .

In this case, the first slave BMS100-1 uses more energy for scanning the second switching signal than the second and third slaves BMS100-2, 100-3. As a result, as in the above embodiment with reference to FIG. 4, the state of charge of the first battery module 20-1 provided with the first slave BMS100-1 is the second and third battery modules 20-2. , 20-3 becomes lower at a faster speed than the charged state. Further, the charging state of the second battery module 20-2 provided with the second slave BMS100-2 becomes lower at a faster speed than the charging state of the third battery module 20-3.

First to third slave BMS100-1~100-3 is, when _{t 25} which scans the presence of a second Suichingu signal using the first to third scanning pulse signal 601, 602, the host controller 1 outputs an operation start command to the master BMS200.

Master BMS200, depending on the operation start instruction, may send a second Suichingu signal every set cycle _{P 21} from the time point _{t 26} wirelessly.

Once _{t 26} to the second Suichingu signal is transmitted first in the radio, the first and second scanning pulse signal 601, 602 has a high level, the first and second slave BMS100-1,100-2 is It succeeds in scanning the second switching signal before the third slave 100-3.

Thus, the first and second slave BMS100-1,100-2 each operate by switching from time _{t 26} to the active mode from the sleep mode.

On the other hand, the first slave BMS100-1 is the time _{t 27} has elapsed from the time _{t 26} by a delay time _{R 21} corresponding to their ID, and response signal indicates a successful scan of the second Suichingu signal to the master BMS200 Send wirelessly. The second slave BMS100-2 is the time _{t 28} has elapsed from the time _{t 26} by a delay time _{R 22} corresponding to their ID, and response signal indicates a successful scan of the second Suichingu signal to the master BMS200 Send wirelessly.

Only the third slave BMS100-3 is still in sleep mode. Unlike reference to the previously described FIG. 4 and FIG. 5, the master BMS200, even receives a response signal from the first and second slave BMS100-1,100-2, does not reduce the set period _{P 21} that Is possible. The reason is that the rising edges of the first to third scanning pulse signals 601, 602, and 603 are synchronized, and the master BMS200 knows in advance information about the scanning pulse signal of the first slave BMS100-1. ..

As a result, the master BMS 200 wirelessly transmits the second switching signal at the time t ₂₉ when the set cycle P _{21 has passed from the time t 26 when the second switching signal was finally transmitted.} Once _{t 29,} since the third scanning pulse signal 603 is at a high level, the third slave BMS100-3 can successfully scan the second Suichingu signal. Thus, the third slave BMS100-3 is a time _{t 30} has elapsed from the time _{t 29} by a delay time _{R 23} corresponding to their ID, and response signal indicates a successful scan of the second Suichingu signal master BMS200 Send wirelessly to.

When the master BMS 200 wirelessly receives the response signals from all the slaves BMS 100-1 to 100-3 included in the wireless battery management system 30, the wireless transmission of the second switching signal may be interrupted.

FIG. 7 is a graph showing a process of reducing the difference in remaining capacity between a plurality of battery modules by the wireless battery management system according to the embodiment of the present invention.

With reference to FIG. 7, the first section TP1, the second section TP2, the third section TP3, and the first curve C1, the second curve C2, and the third curve C3 can be confirmed. The first section TP1 is a period _{from the initial time point t INT} to the first switching time point t _S1 , and the second section TP2 is a period _{from the first switching time point t S1} to the second switching time point t _S2 . The interval TP3 is a period from the second switching time point t _S2 to the third switching time point t _S3. Further, the first curve C1 indicates the charging state of the first battery module 20-1, the second curve C2 indicates the charging state of the second battery module 20-2, and the third curve C3 indicates the charging state of the first battery module. The charging state of 20-3 is shown.

During the first section TP1, all of the plurality of slaves BMS 100-1 to 100-3 operate in the active mode. The initial time point t _INT indicates a time point when the balancing between the first to third battery modules 20-1 to 20-3 is completed and they have the same charging state. From the initial time point t _INT to the first switching time point t _S1 , the difference in charging state between the first to third battery modules 20-1 to 20-3 may gradually increase.

The first switching time point t _S1 may correspond to each of _{the time points t 3} , t ₁₈ and t _{23 of} FIGS. 4 to 6. That is, the first switching time _{t S1,} none of the first to third slave BMS100-1~100-3 to operate in the sleep mode. Since the first battery module 20-1 has the highest charge state and the third battery module 20-3 has the lowest charge state, the first slave BMS100-1 has the second and third during the second section TP1. The presence of the second switching signal is scanned using more energy than the slave BMS 100-2, 100-3. Further, the second slave BMS100-2 scans for the presence of the second switching signal during the second section TP1 using more energy than the third slave BMS100-3. As a result, from the first switching time t _S1 to the second switching time t _S2 , the rate of decrease in the charged state of the first battery module 20-1> the rate of decrease in the charged state of the second battery module 20-2> the third battery. This is the rate of decrease in the charged state of module 20-3.

The second switching time point t _S2 is a time point when the difference in charging state between the first to third battery modules 20-1 to 20-3 falls within a predetermined error range. Further, the third switching time point t _S3 may be a time point at which the first to third slaves BMS100-1 to 100-3 are switched from the sleep mode to the active mode.

During the third section TP3, the first to third slaves BMS100-1 to 100-3 are set to have the same scan period and the same scan duration. As a result, from the second switching time point t _S2 to the third switching time point t _S3 , the reduction rates of the charged states of the first to third battery modules 20-1 to 20-3 can be the same. For example, the master BMS200 sets the scan cycle and scan duration preset for each of the first and second slaves BMS100-1 and 100-2, and the scan cycle and scan duration preset for the third slave BMS100-3. Can be changed to.

The embodiment of the present invention described above is not necessarily embodied through an apparatus and a method, but is embodied through a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Obtained, such an embodiment should be easily embodied by an expert in the technical field to which the present invention belongs from the description of the above-mentioned Examples.

Although the present invention has been described above with reference to limited examples and drawings, the present invention is not limited to this, and the technical idea and claims of the present invention by a person having ordinary knowledge in the technical field to which the present invention belongs. Needless to say, various modifications and modifications are possible within the equal range of.

Further, since the above-mentioned invention can be variously replaced, modified and changed within the range not deviating from the technical idea of the present invention by a person having ordinary knowledge in the technical field to which the present invention belongs, the above-mentioned Examples And, without being limited by the attached drawings, all or part of each embodiment can be selectively combined and configured so that various modifications can be made.

10 Battery pack 20 Battery module 30 Wireless battery management system 100 Slave BMS
110 Slave memory 120 Slave communication unit 140 Slave control unit 200 Master BMS
210 Master memory 220 Master communication unit 230 Master power supply unit 240 Master control unit

Claims (7)

It ’s a wireless battery management system.
It is provided on a one-to-one basis in a plurality of battery modules, and is used in an active mode used in a situation where the plurality of battery modules are charged / discharged and in a situation where the plurality of battery modules are not charged / discharged. A plurality of devices configured to operate using the power supplied from the battery module provided in the sleep mode and wirelessly transmit a detection signal indicating the state of the battery module provided in the active mode. Slave BMS and
Includes a master BMS configured to wirelessly receive the detection signal from each of the plurality of slave BMSs.
The master BMS
Based on the detection signal, the scan cycle and the scan duration for each of the plurality of slave BMSs are set.
A control signal including a radio balancing instruction indicating a scan cycle and a scan duration set for each of the plurality of slave BMSs is wirelessly transmitted to the plurality of slave BMSs.
When the operation start command is received from the upper control unit, the second switching signal for inducing the switching from the sleep mode to the active mode is wirelessly transmitted to the plurality of slave BMSs at each set cycle.
Each of the plurality of slave BMS
When the scanning of the second switching signal is successful in the sleep mode, a response signal informing that the scanning of the second switching signal is successful is wirelessly transmitted to the master BMS.
The response signal is wirelessly transmitted to the master BMS when the delay time corresponding to the ID assigned to the user has elapsed from the time when the scanning of the second switching signal is successful.
Wireless battery management system. The master BMS
Based on the detection signal, the charge state of each of the plurality of battery modules is calculated.
The wireless battery management system according to claim 1, wherein a scan cycle and a scan duration for each of the plurality of slave BMSs are set based on the charge state of each of the plurality of battery modules. The master BMS
The radio according to claim 1 or 2, wherein when the operation stop command from the higher control unit is received, the first switching signal for inducing the switching from the active mode to the sleep mode is wirelessly transmitted to the plurality of slave BMSs. Battery management system. Each of the plurality of slave BMS
In the sleep mode, based on the radio balancing command included in the control signal, the battery module is supplied from the battery module provided by the battery module for the scan duration set by the user for each scan cycle set by the user. The wireless battery management system according to any one of claims 1 to 3, wherein the second switching signal is wirelessly scanned using electric power. Each of the plurality of slave BMS
The wireless battery management system according to any one of claims 1 to 4, wherein when the scanning of the second switching signal in the sleep mode is successful, the sleep mode is switched to the active mode. It ’s a wireless battery management system.
It is provided on a one-to-one basis in a plurality of battery modules, and is used in an active mode used in a situation where the plurality of battery modules are charged / discharged and in a situation where the plurality of battery modules are not charged / discharged. A plurality of devices configured to operate using the power supplied from the battery module provided in the sleep mode and wirelessly transmit a detection signal indicating the state of the battery module provided in the active mode. Slave BMS and
Includes a master BMS configured to wirelessly receive the detection signal from each of the plurality of slave BMSs.
The master BMS
Based on the detection signal, the scan cycle and the scan duration for each of the plurality of slave BMSs are set.
A control signal including a radio balancing instruction indicating a scan cycle and a scan duration set for each of the plurality of slave BMSs is wirelessly transmitted to the plurality of slave BMSs.
When the operation start command is received from the upper control unit, the second switching signal for inducing the switching from the sleep mode to the active mode is wirelessly transmitted to the plurality of slave BMSs at each set cycle.
Each of the plurality of slave BMS
When the scanning of the second switching signal is successful in the sleep mode, a response signal informing that the scanning of the second switching signal is successful is wirelessly transmitted to the master BMS.
The master BMS is,
Wherein a plurality of slave BMS each time it receives the response signal, thereby reducing the set cycle by a predetermined value or a predetermined ratio, no line battery management system. It ’s a wireless battery management system.
It is provided on a one-to-one basis in a plurality of battery modules, and is used in an active mode used in a situation where the plurality of battery modules are charged / discharged and in a situation where the plurality of battery modules are not charged / discharged. A plurality of devices configured to operate using the power supplied from the battery module provided in the sleep mode and wirelessly transmit a detection signal indicating the state of the battery module provided in the active mode. Slave BMS and
Includes a master BMS configured to wirelessly receive the detection signal from each of the plurality of slave BMSs.
The master BMS
Based on the detection signal, the scan cycle and the scan duration for each of the plurality of slave BMSs are set.
A control signal including a radio balancing instruction indicating a scan cycle and a scan duration set for each of the plurality of slave BMSs is wirelessly transmitted to the plurality of slave BMSs.
When the operation start command is received from the upper control unit, the second switching signal for inducing the switching from the sleep mode to the active mode is wirelessly transmitted to the plurality of slave BMSs at each set cycle.
Each of the plurality of slave BMS
In the sleep mode, based on the radio balancing command included in the control signal, the battery module is supplied from the battery module provided by the battery module for the scan duration set by the user for each scan cycle set by the user. The second switching signal is wirelessly scanned using electric power.
The master BMS
The slave BMS provided in the battery module in the maximum charged state among the plurality of battery modules is set as the representative slave BMS.
The control signal is
Includes a setting instruction to specify the representative slave BMS.
The representative slave BMS is,
Wherein the sleep mode, generates a synchronization signal based on the setting instruction, and transmits the synchronization signal wirelessly to the remaining slave BMS, non linear battery management system.

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